"The bottom line is you should try to do whatever you can to maintain the family in the best care, " said Michael Brady, chair of the pediatrics department at Nationwide Children's Hospital in Columbus, Ohio, and a member of the AAP's immunization committee.

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The peace is broken by two young men in tennis whites (Michael Pitt and Brady Corbet), whose polite inquiries gradually harden into threats and then into acts of brutality that feel both groundless and unrelenting.

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CNN's Michael Martinez, Brittany Brady and AnneClaire Stapleton contributed to this report.

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